A railroad car with a mass of 30,000 kg is moving at 2.0 m/s when it runs into an at-rest freight car with an equal mass. The cars lock together. What is their final velocity?

A. 60,000 kg·m/s
B. 1.0 m/s
C. 0.5 m/s
D. 2.0 m/s

Question

A railroad car with a mass of 30,000 kg is moving at 2.0 m/s when it runs into an at-rest freight car with an equal mass. The cars lock together. What is their final velocity?

 		A.	60,000 kg·m/s
 		B.	1.0 m/s
 		C.	0.5 m/s
 		D.	2.0 m/s

irishboy123 · Answer

compare momentum before with momentum after the collision.  it should be the same, giving you your answer